org.springframework.boot.convert.ApplicationConversionService Maven / Gradle / Ivy
/*
* Copyright 2012-2021 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.boot.convert;
import java.util.LinkedHashSet;
import java.util.Set;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.core.convert.converter.Converter;
import org.springframework.core.convert.converter.ConverterRegistry;
import org.springframework.core.convert.converter.GenericConverter;
import org.springframework.core.convert.converter.GenericConverter.ConvertiblePair;
import org.springframework.core.convert.support.ConfigurableConversionService;
import org.springframework.core.convert.support.DefaultConversionService;
import org.springframework.format.Formatter;
import org.springframework.format.FormatterRegistry;
import org.springframework.format.Parser;
import org.springframework.format.Printer;
import org.springframework.format.support.DefaultFormattingConversionService;
import org.springframework.format.support.FormattingConversionService;
import org.springframework.util.StringValueResolver;
/**
* A specialization of {@link FormattingConversionService} configured by default with
* converters and formatters appropriate for most Spring Boot applications.
*
* Designed for direct instantiation but also exposes the static
* {@link #addApplicationConverters} and
* {@link #addApplicationFormatters(FormatterRegistry)} utility methods for ad-hoc use
* against registry instance.
*
* @author Phillip Webb
* @since 2.0.0
*/
public class ApplicationConversionService extends FormattingConversionService {
private static volatile ApplicationConversionService sharedInstance;
public ApplicationConversionService() {
this(null);
}
public ApplicationConversionService(StringValueResolver embeddedValueResolver) {
if (embeddedValueResolver != null) {
setEmbeddedValueResolver(embeddedValueResolver);
}
configure(this);
}
/**
* Return {@code true} if objects of {@code sourceType} can be converted to the
* {@code targetType} and the converter has {@code Object.class} as a supported source
* type.
* @param sourceType the source type to test
* @param targetType the target type to test
* @return if conversion happens via an {@code ObjectTo...} converter
* @since 2.4.3
*/
public boolean isConvertViaObjectSourceType(TypeDescriptor sourceType, TypeDescriptor targetType) {
GenericConverter converter = getConverter(sourceType, targetType);
Set pairs = (converter != null) ? converter.getConvertibleTypes() : null;
if (pairs != null) {
for (ConvertiblePair pair : pairs) {
if (Object.class.equals(pair.getSourceType())) {
return true;
}
}
}
return false;
}
/**
* Return a shared default application {@code ConversionService} instance, lazily
* building it once needed.
*
* Note: This method actually returns an {@link ApplicationConversionService}
* instance. However, the {@code ConversionService} signature has been preserved for
* binary compatibility.
* @return the shared {@code ApplicationConversionService} instance (never
* {@code null})
*/
public static ConversionService getSharedInstance() {
ApplicationConversionService sharedInstance = ApplicationConversionService.sharedInstance;
if (sharedInstance == null) {
synchronized (ApplicationConversionService.class) {
sharedInstance = ApplicationConversionService.sharedInstance;
if (sharedInstance == null) {
sharedInstance = new ApplicationConversionService();
ApplicationConversionService.sharedInstance = sharedInstance;
}
}
}
return sharedInstance;
}
/**
* Configure the given {@link FormatterRegistry} with formatters and converters
* appropriate for most Spring Boot applications.
* @param registry the registry of converters to add to (must also be castable to
* ConversionService, e.g. being a {@link ConfigurableConversionService})
* @throws ClassCastException if the given FormatterRegistry could not be cast to a
* ConversionService
*/
public static void configure(FormatterRegistry registry) {
DefaultConversionService.addDefaultConverters(registry);
DefaultFormattingConversionService.addDefaultFormatters(registry);
addApplicationFormatters(registry);
addApplicationConverters(registry);
}
/**
* Add converters useful for most Spring Boot applications.
* @param registry the registry of converters to add to (must also be castable to
* ConversionService, e.g. being a {@link ConfigurableConversionService})
* @throws ClassCastException if the given ConverterRegistry could not be cast to a
* ConversionService
*/
public static void addApplicationConverters(ConverterRegistry registry) {
addDelimitedStringConverters(registry);
registry.addConverter(new StringToDurationConverter());
registry.addConverter(new DurationToStringConverter());
registry.addConverter(new NumberToDurationConverter());
registry.addConverter(new DurationToNumberConverter());
registry.addConverter(new StringToPeriodConverter());
registry.addConverter(new PeriodToStringConverter());
registry.addConverter(new NumberToPeriodConverter());
registry.addConverter(new StringToDataSizeConverter());
registry.addConverter(new NumberToDataSizeConverter());
registry.addConverter(new StringToFileConverter());
registry.addConverter(new InputStreamSourceToByteArrayConverter());
registry.addConverterFactory(new LenientStringToEnumConverterFactory());
registry.addConverterFactory(new LenientBooleanToEnumConverterFactory());
if (registry instanceof ConversionService) {
addApplicationConverters(registry, (ConversionService) registry);
}
}
private static void addApplicationConverters(ConverterRegistry registry, ConversionService conversionService) {
registry.addConverter(new CharSequenceToObjectConverter(conversionService));
}
/**
* Add converters to support delimited strings.
* @param registry the registry of converters to add to (must also be castable to
* ConversionService, e.g. being a {@link ConfigurableConversionService})
* @throws ClassCastException if the given ConverterRegistry could not be cast to a
* ConversionService
*/
public static void addDelimitedStringConverters(ConverterRegistry registry) {
ConversionService service = (ConversionService) registry;
registry.addConverter(new ArrayToDelimitedStringConverter(service));
registry.addConverter(new CollectionToDelimitedStringConverter(service));
registry.addConverter(new DelimitedStringToArrayConverter(service));
registry.addConverter(new DelimitedStringToCollectionConverter(service));
}
/**
* Add formatters useful for most Spring Boot applications.
* @param registry the service to register default formatters with
*/
public static void addApplicationFormatters(FormatterRegistry registry) {
registry.addFormatter(new CharArrayFormatter());
registry.addFormatter(new InetAddressFormatter());
registry.addFormatter(new IsoOffsetFormatter());
}
/**
* Add {@link GenericConverter}, {@link Converter}, {@link Printer}, {@link Parser}
* and {@link Formatter} beans from the specified context.
* @param registry the service to register beans with
* @param beanFactory the bean factory to get the beans from
* @since 2.2.0
*/
public static void addBeans(FormatterRegistry registry, ListableBeanFactory beanFactory) {
Set